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For instance, here is an example taken from APA style that demonstrates how to cite an article without a known author:
20 years on, world's first Web page to be reborn. (2013). Retrieved April 30, 2013 from http://phys.org/news/2013-04-years-world-web-page-reborn.html

APA: www.apastyle.org/learn/faqs/web-page-no-author.aspx
MLA: owl.english.purdue.edu/owl/resource/747/08/
CMS: schools.fwps.org/tj/middleages/cs.pdf

The following resource from Purdue’s Online Writing Lab is comprehensive, but allows you to compare citation formats across all three style guides: owl.english.purdue.edu

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